First principles calculation of Manganese based half Heusler compounds

Keywords: Half-heusler, Spin polarisation, Optimization, Half- metallic

Abstract

The Half-Heusler compounds exhibit a diverse range of tuneable properties including half-metallic ferromagnetism topological insulator, solar cells and thermoelectric converters. We have studied four half-Heusler compounds MnFeIn, MnFeGa, MnNiAs and MnNiSb. The nature and properties of half-heusler compounds can be studied on the bases of their valance electron count. In this paper, Fe based compounds have 18 valence electrons; whereas 22 valence electrons in Ni based. The Density Functional Theory (DFT) has been performed with WIEN2k code. Ni based compounds with Mn located at octahedral sites are half-metals as revealed from the Density of States (DoS) and band structure calculations. In all of them, spin-up channels are conducting; whereas in MnNiAs and MnNiSb spin-down channels have the small band gaps. MnNiAs and MnNiSb exhibit half-metallic property with integer magnetic moments of 4 μB per formula unit and half-metallic gaps of 0.15 and 0.17 eV at their equilibrium volume respectively.

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Published
2020-08-13
Cited
0 article
How to Cite
Mohan, L., Sukhender, S., Kumar, S., Sharma, D., & Verma, A. (2020). First principles calculation of Manganese based half Heusler compounds. East European Journal of Physics, (3), 122-128. https://doi.org/10.26565/2312-4334-2020-3-15